A satellite link consists of an uplink (transmit earth station to satellite) and a downlink (satellite to the receive earth station); see Figure 4.1. Signal quality over the uplink depends on how strong the signal is when it leaves the source earth station and how the satellite receives it. Also, on the downlink side, the signal quality depends on how strongly the satellite can retransmit the signal and how the receiving earth station receives the signal.
Satellite link design involves a mathematical approach to the selection of link subsystem variables in such a way that the overall system performance criteria are met. The most important performance criterion is the signal quality, that is, the energy per bit noise density ...
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